Beach maintaining apparatus and a beach maintaining method



y 1939- E. J. PRENDER-GAST 2,158,046-

BEACH MAINTAINING APPARATUS AND A BEACH MAINTAINING METHOD Filed March 15, 1937 2 Sheets-Sheet 1 fibula??? e56,

May 9, 1939.

BEACH MAINTAINING APPARATUS AND A BEACH MAINTAINING METHOD FIE. Z.

E. J. PRENDERGAST 2,158,046

Filed March 15, 1957 2 Sheets-Sheet 2 J5! Ml; 071' fa l/(coed J (est,

Patented May 9, 1939 UNITED STATES PATENT OFFICE BEACH MAINTAINING APPARATUS AND A BEACH MAINTAINING METHOD Edmund J. Prendergast, Delray, Fla... assignor of one-half to Edwin B. H. Tower, Jr., Milwaukee, Wis.

Application March 15, 1937, Serial No. 130,842

4 Claims. (Cl. 613) The invention relates to beach maintaining ap-' Fig. 3 is a sectional view showing another way paratus and a beach maintaining method by to arrange the transfer pipe. which a beach deprived of sand from the sea by The beach I has jetties 2 projecting from its a jetty or other obstruction is saved from'erosion shore into the sea and arranged to protect the 5 by the waves. channel into an inlet or harbor 3. 5 a

The beach along the seashore is maintained The prevailing wind blows in the direction indiunder normal conditions by sand drifted along cated by the arrow a and the littoral current flows the shore by the waves and littoral current and along the shore in the direction indicated by the deposited on the beach by the waves. arrow b.

If a jetty or other obstruction projects into the- The terms windward and leeward as used 10' sea, it causes sand to accumulate in its vicinity herein denote the direction in which the sand is from the waves and littoral current and thereby advanced along the shore by the waves and litdeprives the beach to its leeward of sand from toral current.

the Waves and littoral current. Thewindward jettyimpounds sand on its wind- The present invention has for its object to proward side from the waves and littoral current,- 15

vide beach maintaining apparatus by which a and thereby deprives the shore beyond the leebeach deprived of sand from the waves and littoral ward jetty of sand to maintain the beach. current by a jetty or other obstruction is main- In order to save the beach beyond the leeward tained from erosion by the waves. jetty from erosion by the waves, the windward Another object is to provide beach maintaining jetty is provided with beach maintaining apparaappartus which is simple in construction and eftus by which the sand impounded or accumulated fective in operation. I in its vicinity is drawn from the sea and then Another object is to provide beach maintaining delivered into the sea near the shore beyond the apparatus which may be readily and economically leeward jetty. installed and operated. The beach maintaining apparatus further 2' According to the invention hereinafter deserves to keep the channel into the inlet or harscribed, a suction pipe is arranged to draw from bor from being filled by sand from the waves and the sea the sand accumulated in the vicinity of a littoral current. jetty or other obstruction projecting into the sea, The beach maintaining apparatus is provided a pump is connected to the suction pipe to create with a hydraulic pump 4 which is connected to a suction therein to draw sand from the sea, and suction pipe 5 arranged on the windward side of a discharge pipe is connected to the pump and the windward jetty and discharge pipes 6 ararranged to deliver the sand from the pump into ranged on the leewardside of the leeward jetty.

the sea near the shore to the leeward of the jetty The suction pipe depends into a sump 1 aror other obstruction to supply the waves with ranged to accumulate sand impounded by the 35 sand to deposit on the beach. windward jetty, and it is provided at its suction The invention provides beach maintaining apend with a suction nozzle 8. e paratus by which the sand impounded by ajetty The pump is connected to the discharge pipes or accumulated in its vicinity is employed to save 6 by a transfer or delivery pipe 9 extending inthe beach to the leeward from erosion by the wardly along the windward jetty, across the in- 40 Waveslet from the windward jetty 'to the leeward jetty, If the jetty is arranged to protect an inlet or 7 and thence outward along the leeward jetty to harbor, the sand drawn from the sea in' its the discharge pipes.

vicinity is discharged into the sea beyond the in- Abridge In, which extends across the inlet, suplet or harbor to lessenthe accumulation of 'sand ports the transfer pipe between the windward 45 in the channel into the inlet or harbor. jetty and 'the leeward jetty.

The beach maintaining apparatus illustrated in The suction pipe is connected to the pump by a the accompanying drawings and described in the flexible joint II to be moved to differentposihereinafter specification exemplifies the inventions in the sump.

tion. The pump is driven by an electric motor H mm 50 The views in these draw s are as follows: nected thereto through a driving shaft l3 ar- Fig. l is a plan view showing the beach mainranged'in bearings l4. taining apparatus. The pump and motor are located on the wind Fig. 2 is a sectional view showing in elevation ward jetty within a pump-house l5. the pump and other appliances. 'The suction pipe may be moved to difierent 55 7 ring l0.

parts of the sump by a derrick l6, which is shown in the drawings by a diagrammatic representation thereof.

The derrick is provided with a mast I'I supported on the pump-house and a beam l8 extending from the mast and connected thereto by a The derrick may. assume various forms and other appliances may be employed in place thereof to move the suction pipe.

When the beach maintaining apparatus is in operation, the. pump draws sand in suspension from the sumpthrough the suction pipe and delivers it through the delivery or transfer pipe to. -the discharge pipes.

The discharge pipes deliver the sand into the sea near the shore beyond the leeward jetty, and then the waves deposit the sand upon the shore .to maintainthe beach to the leeward from erosion by the waves.

Fig. 3 shows a modification in the way to arrange the delivery or transfer pipe to convey sand from the pump to the discharge pipes.

' The delivery or transfer pipe in'this modification extends under the water-in the inlet and it is enclosed in a tubular casing 25 to protect it from abrasion and erosion by.moving sand and'other matter.

The invention described herein may be employed and embodied in various ways which will be within the scope thereof as-defined by the hereinafter'claims.

The invention described in the foregoingspeciflc'ation andshown in the drawings is hereby defined and claimed as follows:

1. Beach maintaining apparatus, comprising the combination with a jetty or other obstrucv tion projecting from abeach into the sea, oi. a sump arranged on the windward side of said jetty to accumulate sand from the waves and littoral current, a suction pipe arranged to draw sand from said swim, a pump connected to said sucon pipe to create suction therein, and a discharge pipe arranged to deliver said sand from said pump into the sea near the shore to the leeward of said jetty.

2. Beach maintaining apparatus, comprising" the combination with an obstruction projecting into the sea and causing sand to accumulate in its vicinity from the waves andlittoral current, a suction pipe arranged to draw said sand from. the

sea, a pump connected to said suction pipe to create suction therein, and a discharge pipe.con-; nected to said pump and arranged to deliver said sand into the sea near the shore to the leeward-oi said obstruction and thereby supply the waves with sand to deposit on the beach.

3. Beach maintaining apparatus to save a beach from erosion and protect a channel into an inlet or harbor, comprising the combination with an obstruction projecting into the sea on the windward side of aninlet or harbor-and causing sand to acumulate in its vicinity from the waves and littoral current, a suction pipe arranged to draw said sand from the sea, a pump connected to said suction pipe to create suction therein, a transfer pipe connected to said pump to. convey said sand to the leeward side of said inlet or harbor, and a discharge pipe connected to said transfer pipe and arranged to deliver said sand into the sea near the shore to the leeward of said inlet or harbo'r and thereby supply the waves with sand to deposit on the beach.

4. The method of maintaining a beach deprived of sand by a jetty or other obstruction projecting into the sea and causing sand to accumulate in its vicinity from the waves and littoral-current, comprising drawing said sand from-the sea and .then delivering said sand into the sea near the shore to the leeward of said jetty or other obstruction and thereby supplying the waves with sand to deposit on the beach.

EDMUND J. PRENDERGAST. 

